Sony MDX-C7900, Service Manual

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MAIN BOARD IC700 (MASTER CONTROLLER)
Pin No. Pin Name I/O Function
1 to 7 NC O
Not used (open)
8 VCC —
Power supply terminal (+5V)
9 PLL SI I PLL serial data input from the FM/AM PLL (IC100)
10 PLL SO O PLL serial data output to the FM/AM PLL (IC100)
11 PLL CKO O PLL serial data transfer clock signal output to the FM/AM PLL (IC100)
12 NOSE SW I Detects the removal of the attaching and removing type front panel block “L”: attaching
13 LCD SO O Serial data output to the liquid crystal display driver (IC801)
14 LCD CKO O Serial data transfer clock signal output to the liquid crystal display driver (IC801)
15 BEEP O Beep sound drive signal output terminal
16 DBMOD2 O D-BASS mode control signal output to the SM5852ES (IC201)
17 to 19 NC O Not used (open)
20 UNI SI I Serial data input from the SONY bus interface (IC600)
21 UNI SO O Serial data output to the SONY bus interface (IC600)
22 UNI CKO O
Serial data transfer clock signal output to the MD mechanism controller (IC501) and SONY bus
interface (IC600)
23 to 25 NC O Not used (open)
26 VOL SO O Serial data output to the electrical volume (IC300)
27 VOL CKO O Serial data transfer clock signal output to the electrical volume (IC300)
28 DSTSEL0 I
Destination setting terminal
(US, Canadian models: fixed at “H”, E model and MDX-C7900R: fixed at “L”)
29 SYSRET O
System reset signal output to the MD mechanism controller (IC501) and SONY bus interface
(IC600) “L”: reset
30 DSTSEL1 I
Destination setting terminal
(US, Canadian models and MDX-C7900R: fixed at “L”, E model: fixed at “H”)
31 DMOD1 O
D-BASS mode control signal output to the SM5852ES (IC201)
32 TESTIN
I Setting terminal for the test mode “L”: test mode (normally fixed at “H”)
33
VSS — Ground terminal
34 C —
Connected to capacitor (for coupling)
35 NC O
Not used (open)
36 BUS ON
O
Bus on/off control signal output to the MD mechanism controller (IC501) and SONY bus
interface (IC600) “L”: bus on
37 AD ON
O Power supply on/off control signal output for the A/D converter “L”: power on
38 DVCC —
Power supply terminal (+5V) (for D/A converter)
39 DVSS —
Ground terminal (for D/A converter)
40 LCDANG
O Output signal for the LCD view angle adjustment “H”: When front panel is full open
41 VOL CE
O Chip enable signal output to the electrical volume (IC300)
42 AVCC
— Power supply terminal (+5V) (for A/D converter)
43 AVRH
I Reference voltage (+5V) input terminal (for A/D converter)
44 AVRL
I Reference voltage (0V) input terminal (for A/D converter)
45 AVSS
— Ground terminal (for A/D converter)
46 KEY IN0
I
Key input terminal (A/D input) OFF, SOURCE, SEEK/AMS > M + . m – ,
SOUND, SHIFT, 1, 2, 3, 4 keys input (LSW801 to LSW804 and LSW806 to LSW811)
MDX-C7900 MDX-C7900R
Type A MB90574PFV-G-114-BND MB90574PFV-G-113-BND
Type B MB90574PFV-G-114 MB90574PFV-G-113